Summary: We're baking some useful things into ActionHeader, would like to consolidate it's use around the site for consistency.
Test Plan: Tested log out dialog, attach dependencies, delete document in phriction.
Reviewers: epriestley, btrahan
Reviewed By: epriestley
CC: aran, Korvin, AnhNhan
Differential Revision: https://secure.phabricator.com/D5635
